I don't believe you can get Keldeo on the pokewalker because the pokewalker is for Heartgold and Soulsilver which is only the Kanto-Johto reigon (Mostly johto.).
At the time Heartgold and SoulSilver was released in 2010, very few even heard of black and white, and none of keldeo.
Basically, you DON'T get it on the pokewalker, it isn't possible to get keldeo at all unless you can somehow trade from a black and white 2 from Japan which is very unlikely.
you don't catch Keldeo, you have to get him as an event. :(
Yes, Keldeo is a legendary Pokemon.
Here's some codes I found for Keldeo. Ordinary Forme Keldeo skin: KELDEOCGEARBW Resolute Forme Keldeo skin: KELDEOCGEARBW2
there is 2 forms of keldeo
Keldeo Resolute Form in Pokemon is when Keldeo has the secret sword. This is an evolution from standard form.
keldeo has yet to be released on the Internet/wi-fi. but there are some clues that there is going to be a keldeo event. be patient.
Keldeo is a real pokemon. Incidentally, keldeo was introduced in Pokemon Black and White.
Keldeo is obtained only through an event
Keldeo is a Water and Fighting type pokemon.
you can get keldeo by pokecheck
U go suck a ballsack and win a free keldeo
No, you cannot get Meloetta or Keldeo after beating the Champion.